WO2021081756A1 - Procédé et appareil d'affichage d'image vidéo - Google Patents

Procédé et appareil d'affichage d'image vidéo Download PDF

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Publication number
WO2021081756A1
WO2021081756A1 PCT/CN2019/114027 CN2019114027W WO2021081756A1 WO 2021081756 A1 WO2021081756 A1 WO 2021081756A1 CN 2019114027 W CN2019114027 W CN 2019114027W WO 2021081756 A1 WO2021081756 A1 WO 2021081756A1
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WO
WIPO (PCT)
Prior art keywords
camera
angle
view
coordinates
horizontal
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Application number
PCT/CN2019/114027
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English (en)
Chinese (zh)
Inventor
房增华
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苏州随闻智能科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 苏州随闻智能科技有限公司 filed Critical 苏州随闻智能科技有限公司
Priority to US17/732,481 priority Critical patent/US20230146794A1/en
Priority to PCT/CN2019/114027 priority patent/WO2021081756A1/fr
Priority to CN201980101819.8A priority patent/CN114641984A/zh
Publication of WO2021081756A1 publication Critical patent/WO2021081756A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/61—Control of cameras or camera modules based on recognised objects
    • H04N23/611—Control of cameras or camera modules based on recognised objects where the recognised objects include parts of the human body
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/695—Control of camera direction for changing a field of view, e.g. pan, tilt or based on tracking of objects
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/16—Human faces, e.g. facial parts, sketches or expressions
    • G06V40/161—Detection; Localisation; Normalisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/69—Control of means for changing angle of the field of view, e.g. optical zoom objectives or electronic zooming

Definitions

  • This application relates to the technical field of video image processing, in particular to a video image display method and device.
  • video conferencing systems have been increasingly widely used.
  • the video conference system uses communication networks and multimedia terminal equipment to realize face-to-face remote instant meetings between participants in different places.
  • Existing video conferencing systems usually use video conferencing cameras to capture video images of participants and present them to the video conferencing display terminal through network transmission.
  • the embodiments of the present application provide a video image display method and device, which are used to solve the problem of poor display of a person's video image in a video conference system in the prior art.
  • an embodiment of the present application proposes a video image display method, which includes the following steps:
  • the angle of view of the camera is adjusted so that all persons photographed by the camera can maximize Displayed in the video image output by the camera.
  • the camera includes a wide-angle camera; wherein, the obtaining the maximum field of view image captured by the camera includes obtaining a full field of view image captured by the wide-angle camera.
  • the method further includes setting the horizontal field of view and the vertical field of view of the wide-angle camera into a plurality of gears at predetermined intervals, respectively.
  • the adjusting the angle of view of the camera based on the minimum and maximum values of the coordinates in the horizontal direction and the minimum and maximum values of the coordinates in the vertical direction of all the faces of the human face includes:
  • the method further includes: tracking the position change of the human face in the video image output by the camera in real time, and dynamically adjusting the horizontal field of view angle gear and the vertical field of view angle gear.
  • the camera includes a rotatable camera; wherein the obtaining the maximum field of view image captured by the camera includes obtaining the maximum field of view image that the rotatable camera can reach by rotating the lens in the horizontal and vertical directions.
  • the adjusting the angle of view of the camera based on the minimum and maximum values of the coordinates in the horizontal direction and the minimum and maximum values of the coordinates in the vertical direction of all the faces of the human face includes:
  • the method further includes: tracking the position change of the human face in the video image output by the camera in real time, and dynamically rotating the horizontal angle and the vertical angle of the rotatable camera.
  • the horizontal and vertical coordinates of all human faces include the coordinates of at least two corner points of the detected rectangular frame of the human face.
  • an embodiment of the present application proposes a video image display device, including:
  • the acquisition module is configured to acquire the maximum angle of view image taken by the camera
  • a detection module configured to detect the horizontal and vertical coordinates of all faces in the maximum field of view image
  • a calculation module configured to calculate the minimum and maximum values of the coordinates in the horizontal direction and the minimum and maximum values of the coordinates in the vertical direction of all the faces;
  • the adjustment module is configured to adjust the angle of view of the camera based on the minimum and maximum values of the coordinates in the horizontal direction and the minimum and maximum values of the coordinates in the vertical direction of all the faces, so that the camera can shoot All personnel of are displayed in the video image output by the camera to the maximum extent.
  • the camera includes a wide-angle camera; wherein the acquisition module is configured to acquire a full-frame angle of view image captured by the wide-angle camera.
  • the horizontal field of view and the vertical field of view of the wide-angle camera are respectively set into multiple gears at predetermined intervals.
  • the adjustment module is further configured to:
  • the device further includes: a tracking module configured to track changes in the position of the human face in the video image output by the camera in real time, and dynamically adjust the horizontal field of view angle gear and the vertical field of view angle gear Bit.
  • a tracking module configured to track changes in the position of the human face in the video image output by the camera in real time, and dynamically adjust the horizontal field of view angle gear and the vertical field of view angle gear Bit.
  • the camera includes a rotatable camera; wherein, the acquisition module is configured to obtain an image of the maximum field of view that the rotatable camera can reach by rotating the lens in the horizontal and vertical directions.
  • the adjustment module is further configured to:
  • the device further includes a tracking module configured to track changes in the position of the human face in the video image output by the camera in real time, and dynamically rotate the horizontal and vertical angles of the rotatable camera.
  • the horizontal and vertical coordinates of all human faces include the coordinates of at least two corner points of the detected rectangular frame of the human face.
  • the embodiments of the present application also provide a computer-readable storage medium on which one or more computer programs are stored, and the one or more computer programs are executed by the processor to implement the steps of the method described in the foregoing embodiments .
  • the embodiment of the present application adjusts the angle of view of the camera based on face position detection, adaptively presents the face display screen, realizes the maximized face framing, and improves the display effect of the person's video image in the video conference system.
  • Fig. 1 is a schematic flowchart of a video image display method according to an embodiment of the present application
  • Figure 2 is a schematic diagram of the horizontal field of view gear setting of the wide-angle camera
  • Figure 3 is a schematic diagram of the vertical field of view gear setting of the wide-angle camera
  • Figure 4 is a schematic diagram of face position detection based on a wide-angle camera
  • Figure 5 is a schematic diagram of face position detection based on a rotatable camera
  • Fig. 6 is a structural example diagram of a video image display device according to an embodiment of the present application.
  • Fig. 7 is a structural example diagram of a video image display device according to another embodiment of the present application.
  • the embodiments of the present application propose a video image display method and device, which adaptively adjusts the field of view (FOV) of the camera based on face position detection, so as to achieve the best picture framing of personnel, thereby It can improve the display effect of people's video images in the video conference system.
  • FOV field of view
  • the field of view is the range of angles taken by the camera lens.
  • the lens is the apex, and the angle formed by the two edges of the maximum range of the lens that the object image can pass through can be It is called the angle of view.
  • the maximum angle range of the lens shot in the horizontal direction can be called the horizontal field of view; the maximum angle range of the lens shot in the vertical direction can be called the vertical field of view.
  • Fig. 1 is a schematic flowchart of a video image display method according to an embodiment of the present application. As shown in FIG. 1, the video image display method of the embodiment of the present application includes the following steps:
  • Step S110 acquiring a maximum angle of view image taken by the camera
  • Step S120 detecting the horizontal and vertical coordinates of all faces in the image with the maximum angle of view
  • Step S130 Calculate the minimum and maximum values of the coordinates of all faces in the horizontal direction and the minimum and maximum values of the coordinates in the vertical direction;
  • Step S140 Adjust the field of view of the camera based on the minimum and maximum values of the coordinates in the horizontal direction and the minimum and maximum values of the coordinates in the vertical direction of all faces, so that all persons photographed by the camera are maximized
  • the ground is displayed in the video image output by the camera.
  • the embodiment of the application obtains the maximum field of view image taken by the camera, dynamically adjusts the field of view of the camera based on the coordinate detection of the face in the maximum field of view image, adaptively presents the face display screen, and realizes the person in the video image The best display effect.
  • the image with the maximum angle of view captured by the camera in step S110 may be understood as a video image captured by the camera with the visual range of the maximum angle of view.
  • the camera used in step S110 may include a wide-angle camera or a rotatable camera.
  • the wide-angle camera is a camera lens with a focal length shorter than a standard lens and a field angle larger than that of a standard lens.
  • a rotatable camera is a camera lens in which the lens can rotate a certain angle in different directions such as up and down, left and right, to achieve target shooting in different angle ranges.
  • the maximum field of view image taken by the wide-angle camera includes the full field of view image taken by the physical lens of the wide-angle camera.
  • Full Frame means that the area of the photosensitive element of the camera reaches a full frame size of 36mm*24mm.
  • the full-frame angle of view image taken by the wide-angle camera is the full-frame image taken within the range of the maximum horizontal and vertical angle of view.
  • the maximum field of view image captured by the rotatable camera includes the maximum field of view image that the rotatable camera can rotate the lens in the horizontal and vertical directions, that is, the lens is rotated to the maximum in the horizontal and vertical directions.
  • the angle of the image taken within the maximum viewable range.
  • Figures 2-4 exemplarily present an implementation of dynamically adjusting the angle of view based on a wide-angle camera.
  • the horizontal field of view and the vertical field of view of the wide-angle camera may be respectively set to multiple gears at predetermined intervals.
  • this embodiment sets the horizontal field of view of the wide-angle camera into multiple gears at 10° intervals, such as 120°, 110°, 100°, 90°, 80°, 70°. °.
  • the horizontal angle of view of the wide-angle camera is not less than 100°.
  • the vertical field of view of the wide-angle camera is also set to multiple gears at 10° intervals, such as 50°, 60°, 70°, and 80°.
  • the gear interval between the horizontal field of view and the vertical field of view of the wide-angle camera can be set to an appropriate angle according to the application scenario and the adjustment granularity, and is not limited to the 10° listed in the above example, and can also be other angles, such as 5°, 15°, 20°, etc.
  • this embodiment can collect the full field of view image (that is, the maximum field of view image) of the wide-angle camera at a rate of 1 frame/sec.
  • the position of the face is detected, and the (X, Y) and (X', Y') coordinates of the upper left and lower right corners of the rectangular frame of the face are recorded.
  • the coordinates of the lower left and upper right corners of the rectangular frame of the face may also be recorded.
  • the factors that affect the number of detectable faces include light, face angle, occlusion, sharpness, and so on.
  • the horizontal angle position corresponding to the minimum and maximum values of the coordinates of the face in the horizontal direction in the full field of view image of the wide-angle camera can be determined. , Calculate the minimum horizontal field of view gear that can view the face in the screen, and then adjust the horizontal field of view of the wide-angle camera to the minimum horizontal field of view gear.
  • the framing of the face image in the minimum horizontal field of view, can be symmetrical or asymmetrical, so that all faces are within the field of view of the camera and the shots are taken.
  • the margins of the video image are minimal.
  • the vertical angle positions of the minimum and maximum values of the coordinates of the face in the vertical direction can be determined in the full field of view image of the wide-angle camera. , So as to determine the best vertical field of view gear for framing the human face, and then adjust the vertical field of view of the wide-angle camera to the best vertical field of view gear.
  • the vertical viewing angle of the viewfinder includes all human faces, and a margin of 1/2 the height of the human face is left up and down.
  • Fig. 5 presents an exemplary embodiment of dynamically adjusting the angle of view based on a rotatable camera.
  • the lens of the rotatable camera is rotated to the maximum left-to-right and up-and-down rotation angles, and the reachable field of view image (that is, the maximum field of view image) is collected; all faces in the reachable field of view image are detected Horizontal and vertical coordinates; calculate the minimum and maximum values of the coordinates of all faces in the horizontal direction and the minimum and maximum values of the coordinates in the vertical direction; based on the minimum values of the coordinates of all faces in the horizontal direction And the maximum value and the minimum and maximum values of the coordinates in the vertical direction, respectively, adjust the horizontal and vertical angles of the rotatable camera to the appropriate angles to maximize the display area of people.
  • the horizontal field of view A of the rotatable camera can be rotated 30° to the left and 30° to the right, and the vertical field of view B can be rotated 15° upwards and 15° downwards.
  • the horizontal and vertical field of view A and B of the rotatable camera can be rotated from left to right, up and down, and the angle range can be set to a suitable angle according to the application scene and shooting range, and is not limited to the above examples.
  • the specific angles listed, and the angle ranges that the horizontal field angle A and the vertical field angle B of the rotatable camera can be rotated in the left and right, up and down directions may be the same or different.
  • this embodiment detects the positions of all faces in the reachable field of view image, and records the (X, Y) and (X', Y') of the upper left and lower right corners of the rectangular frame of the face. ) Coordinates, and map the face coordinates to the virtual space that can reach the field of view image. It should be understood that in some alternative implementations, the coordinates of the lower left and upper right corners of the rectangular frame of the face may also be recorded.
  • the horizontal field of view of the rotatable camera corresponding to the minimum and maximum values of the coordinates of the face in the horizontal direction can be determined, and the calculation can be used to calculate the horizontal field of view of the rotatable camera. All the framing is in the horizontal angle of view in the screen, and then the horizontal angle of the rotatable camera is rotated to realize the framing of all faces.
  • the side with less face can be discarded according to a preset rule, or the center position can be selected so that people on both sides There are just as few faces, so as to ensure that there are most faces in the field of view.
  • the vertical field of view of the rotatable camera corresponding to the minimum and maximum values of the coordinates of the face in the vertical direction can be determined. All the framing is in the vertical angle of view in the screen, and then the vertical angle of the rotatable camera is rotated to realize the framing of all faces.
  • a multi-frame tracking technology can be used to predict the direction of the face moving out of the screen, and the camera can be rotated to track people moving in the meeting.
  • Fig. 6 is a schematic structural diagram of a video image display device according to an embodiment of the present application. As shown in FIG. 6, the video image display device of the embodiment of the present application includes the following modules:
  • the acquisition module 210 is configured to acquire a maximum field of view image taken by the camera
  • the detection module 220 is configured to detect the horizontal and vertical coordinates of all faces in the maximum field of view image
  • the calculation module 230 is configured to calculate the minimum and maximum values of the coordinates in the horizontal direction and the minimum and maximum values of the coordinates in the vertical direction of all the faces;
  • the adjustment module 240 is configured to adjust the angle of view of the camera based on the minimum and maximum values of the coordinates in the horizontal direction and the minimum and maximum values of the coordinates in the vertical direction of all the faces, so that the camera All the people photographed are displayed in the video image output by the camera to the maximum extent.
  • the camera may include a wide-angle camera
  • the acquisition module 210 is further configured to obtain a maximum angle of view image captured by the wide-angle camera.
  • the maximum field of view image taken by the wide-angle camera includes the full field of view image taken by the physical lens of the wide-angle camera.
  • the horizontal field of view and the vertical field of view of the wide-angle camera are respectively set to multiple gears at predetermined intervals. Examples of the gear setting of the horizontal field of view and the vertical field of view of the wide-angle camera are shown in Figs. 2 and 3, which will not be repeated here.
  • the adjustment module 240 is further configured to:
  • the device may further include a tracking module 250 configured to track changes in the position of the face in the current video image captured by the camera in real time, and dynamically adjust the horizontal field of view gear And the vertical field of view gear.
  • the tracking module 250 can track the position change of the face in real time at a rate of 1 frame/sec. If the face moves outside the current display screen and continuously detects that all 3 frames are outside the screen, the horizontal or vertical expansion is performed.
  • the angle of view to a wider gear so as to ensure that the face is displayed within the video screen; if the face is gathered to the center of the picture, and 3 consecutive frames are detected to enter the gear with a narrower horizontal or vertical field of view, adjust the horizontal or Vertical field of view to a narrower gear.
  • the camera may include a rotatable camera.
  • the acquisition module 210 is also configured to acquire images with a maximum angle of view captured by the rotatable camera.
  • the maximum field of view image taken by the rotatable camera includes the maximum field of view image that the rotatable camera can reach by rotating the lens in the horizontal and vertical directions.
  • the adjustment module 240 is further configured to:
  • the tracking module 250 may also be configured to track changes in the position of the human face in the video image output by the camera in real time, and dynamically rotate the horizontal and vertical angles of the rotatable camera.
  • the tracking module 250 can predict the direction of the face moving out of the screen through a multi-frame tracking technology, and rotate the lens to track the moving people in the meeting.
  • the tracking module 250 can track the position change of the human face in real time at a rate of 1 frame/sec. If the human face moves outside the currently displayed image, it continuously detects the edges of the image that are all outside the image and in the opposite direction for 3 frames. If there is no face, rotate the lens to the direction that the face moves out of the screen, so that the face is displayed in the viewfinder again.
  • the horizontal and vertical coordinates of all human faces include the coordinates of at least two corner points of the detected rectangular frame of the human face.
  • detecting the coordinates of the face in the horizontal direction and the vertical direction refer to FIGS. 4 and 5, which will not be repeated here.
  • the steps, units, or modules involved in the embodiments of the present application can be implemented by software, hardware, or a combination thereof.
  • the described steps, units, or modules can also be implemented in a camera device or computing device, where the name of the unit or module does not constitute a limitation on the unit or module itself.
  • the camera device or computing device usually includes a processor that executes a program, and a memory for storing the program, where the program can implement the method steps described in this application when the program is loaded into the processor and run.
  • an embodiment of the present application may include a computer program product, which includes a readable storage medium storing one or more computer programs, and the computer program includes program code for executing the method described in the present application.
  • the embodiments of the present application may also include a computer-readable storage medium that stores one or more programs, and the one or more programs are executed by one or more processors. When executed, the method steps described in this application can be realized.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
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Abstract

Procédé et appareil d'affichage d'image vidéo comprenant : l'obtention d'un champ de vision maximal obtenu par une caméra par photographie ; la détection des coordonnées de toutes les faces dans une direction horizontale et une direction verticale dans le champ de vision maximal ; calcul de la valeur minimale et de la valeur maximale des coordonnées de toutes les faces dans la direction horizontale et de la valeur minimale et de la valeur maximale des coordonnées de toutes les faces dans la direction verticale ; sur la base de la valeur minimale et de la valeur maximale des coordonnées de toutes les faces dans la direction horizontale et de la valeur minimale et de la valeur maximale des coordonnées de toutes les faces dans la direction verticale, l'ajustement de l'angle de vision de la caméra pour permettre à toutes les personnes photographiées par la caméra d'être affichées de manière maximale sur une image vidéo produite par la caméra. La présente invention ajuste dynamiquement l'angle de vision d'une caméra sur la base de la détection de position de visages, et présente de manière adaptative des images d'affichage de visages, ce qui permet d'améliorer l'effet d'affichage d'images vidéo de personnel dans un système de visioconférence.
PCT/CN2019/114027 2019-10-29 2019-10-29 Procédé et appareil d'affichage d'image vidéo WO2021081756A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US17/732,481 US20230146794A1 (en) 2019-10-29 2019-10-29 Video image display method and apparatus
PCT/CN2019/114027 WO2021081756A1 (fr) 2019-10-29 2019-10-29 Procédé et appareil d'affichage d'image vidéo
CN201980101819.8A CN114641984A (zh) 2019-10-29 2019-10-29 视频图像显示方法和装置

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Application Number Priority Date Filing Date Title
PCT/CN2019/114027 WO2021081756A1 (fr) 2019-10-29 2019-10-29 Procédé et appareil d'affichage d'image vidéo

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CN117237438B (zh) * 2023-09-18 2024-06-28 共享数据(福建)科技有限公司 一种三维模型和无人机视频数据的范围匹配方法与终端

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US20100141772A1 (en) * 2008-12-04 2010-06-10 Ritsuo Inaguma Image processing device and method, image processing system, and image processing program
CN103248824A (zh) * 2013-04-27 2013-08-14 天脉聚源(北京)传媒科技有限公司 一种摄像头拍摄角度的确定方法、装置及摄像系统
CN103327250A (zh) * 2013-06-24 2013-09-25 深圳锐取信息技术股份有限公司 基于模式识别镜头控制方法
EP3096204A1 (fr) * 2015-05-20 2016-11-23 Panasonic Intellectual Property Management Co., Ltd. Dispositif d'affichage d'image et dispositif de traitement d'image
CN106603912A (zh) * 2016-12-05 2017-04-26 科大讯飞股份有限公司 一种视频直播控制方法及装置

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US20100141772A1 (en) * 2008-12-04 2010-06-10 Ritsuo Inaguma Image processing device and method, image processing system, and image processing program
CN103248824A (zh) * 2013-04-27 2013-08-14 天脉聚源(北京)传媒科技有限公司 一种摄像头拍摄角度的确定方法、装置及摄像系统
CN103327250A (zh) * 2013-06-24 2013-09-25 深圳锐取信息技术股份有限公司 基于模式识别镜头控制方法
EP3096204A1 (fr) * 2015-05-20 2016-11-23 Panasonic Intellectual Property Management Co., Ltd. Dispositif d'affichage d'image et dispositif de traitement d'image
CN106603912A (zh) * 2016-12-05 2017-04-26 科大讯飞股份有限公司 一种视频直播控制方法及装置

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